Market Leader Chosen By The Bahamas Telecom Company To Migrate Existing Countrywide Wireline Network To IP Based Infrastructure

Westford, MA., May 23, 2008 – Sonus Networks, Inc. (Nasdaq: SONS), a market leader in IP communications infrastructure, and The Bahamas Telecommunications Company Limited (BTC) have signed an agreement to bring a next generation communications network to The Bahamas. This is a major advancement in the convergence of voice and Internet services that will give the people of The Bahamas a world leading communications infrastructure.

Sonus Networks has been chosen to replace the legacy technology across the entire wireline network, and will plan and manage the migration and implementation from core to edge of the new network, using its IP based technology. Sonus will also deploy equipment from market leading access solutions partner Calix, to manage and deliver advanced IP services from the central office to the network edge. BTC is making this investment in the future of the Bahamian Commonwealth's communications industry to provide a network that will enable it to maintain a lead over future competitors and be responsive to subscribers' needs.

"The Bahamas Telecommunications Company continues to deliver on its promise to provide leading edge technology to maintain the competitive position of The Bahamas in the global marketplace. Our customers deserve the highest quality of voice and Internet services," commented I. Kirk Griffin, executive vice president at BTC. "By migrating from the traditional network to an IP-based infrastructure from Sonus Networks, we are bringing world class communications throughout our region. We are preparing for the future delivery of next generation network services, enabling our business and residential communities to remain globally competitive and connected."

BTC concluded that the fully integrated IP-based platform from Sonus Networks will bring significant reduction in the amount of equipment needed to manage the growing traffic across BTC's network, when compared to their existing legacy systems. BTC estimates that, by choosing Sonus technology, it will save over a million dollars a year in energy costs alone, and approximately another million dollars a year in maintenance and upgrades. The plan also includes a disaster recovery site located in Miami, to allow BTC to quickly recover the islands' communications network, should an unforeseen event such as a hurricane cause outages in Nassau.

"BTC is taking a leap forward, and investing in the future of communications," commented Hassan Ahmed, CEO and chairman at Sonus Networks. "BTC is ahead of many major carriers in its adoption of IP-based telephony. We are proud to be chosen for this country-wide deployment, and look forward to continuing our relationship with BTC, enabling it to deliver new services to both business and home subscribers."

Sonus is migrating the entire wireline network, which is spread across 16 islands. The Sonus components that will be implemented include the Sonus Insight Element Management System (EMS)TM, Sonus PSX TM, Sonus GSX9000 TM media gateway and Network Border SwitchTM, the Sonus ASX TM Class 5 feature server and Sonus SGX TM. This advanced IP-based network also includes the integration of access solutions from Calix, including the Calix C7 Multiservice Access Platform (MSAP); the most widely deployed MSAP in North America. The network components will be primarily installed in the islands of Grand Bahamas and New Providence. The other islands will be served by this centralized equipment over the BTC MPLS network. BTC will also have equipment located in Miami, to terminate traffic to local US carriers, as well as function as a disaster recovery site. If an unforeseen event occurs, the islands' communications network can be quickly recovered by the back up network components located in Miami.

About Sonus Networks

Sonus Networks, Inc. is a market leader in IP communications infrastructure for wireline and wireless service providers. With its comprehensive IP Multimedia Subsystem (IMS) solution, Sonus addresses the full range of carrier applications, including residential and business voice services, wireless voice and multimedia, trunking and tandem switching, carrier interconnection and enhanced services. Sonus' voice infrastructure solutions are deployed in service provider networks worldwide. Founded in 1997, Sonus is headquartered in Westford, Massachusetts. Additional information on Sonus is available at http://www.sonusnet.com.

This release may contain forward-looking statements regarding future events that involve risks and uncertainties. Readers are cautioned that these forward-looking statements are only predictions and may differ materially from actual future events or results. Readers are referred to Item 1A "Risk Factors" of Sonus' Quarterly Report on Form 10-Q for the period ended March 31, 2008, filed with the SEC, which identifies important risk factors that could cause actual results to differ from those contained in the forward-looking statements. Risk factors include among others: the impact of material weaknesses in our disclosure controls and procedures and our internal control over financial reporting on our ability to report our financial results timely and accurately; the unpredictability of our quarterly financial results; risks and uncertainties associated with the Company's restatement of its historical stock option granting practices and accounting including regulatory actions or litigation; risks associated with our international expansion and growth; consolidation in the telecommunications industry; and potential costs resulting from pending securities and patent litigation against the Company. Any forward-looking statements represent Sonus' views only as of today and should not be relied upon as representing Sonus' views as of any subsequent date. While Sonus may elect to update forward-looking statements at some point, Sonus specifically disclaims any obligation to do so, except as required by law.

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